package com.sky.mapper;

import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.ShoppingCart;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Update;

import java.util.List;

@Mapper
public interface ShoppingCartMapper {
    //条件查询
    List<ShoppingCart> list(ShoppingCart shoppingCart);//传过来的是购物车对象，实际是根据用户id查询购物车

    //更新商品数量
    @Update("update shopping_cart set number = #{number} where id = #{id}")
    void updateNumberById(ShoppingCart cart);

    //插入购物车数据
    void insert(ShoppingCart shoppingCart);

    /**
     * 根据用户id删除购物车数据
     *
     * @param userId
     */
    @Delete("delete from shopping_cart where user_id = #{userId}")
    void deleteByUserId(Long userId);

    //删除购物车中的一个商品
    void delete(ShoppingCartDTO shoppingCartDTO);
}
